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(i) Find the current flowing through the resistance \( R_{1} \) of the circuit shown in figure if the resistances are equal to \( R_{1}=10 \Omega, R_{2}=20 \Omega \), and \( R_{3}=30 \Omega \), and the potentials of points 1,2 and 3 are equal to \( \varphi_{1}=10 \mathrm{~V}, \varphi_{2}=6 \mathrm{~V} \), and \( \varphi_{3}=5 \mathrm{~V} \).
(A) \( 0.1 \mathrm{~A} \)
(B) \( 0.2 \mathrm{~A} \)
(C) \( 0.3 \mathrm{~A} \)
(D) \( 0.4 \mathrm{~A} \)
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